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Volume and Surface Area — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsVolume and Surface Area3 Marks
Question
Find the volume and surface area of a sphere whose radius is: $\big(\text{Take}\ \pi=\frac{22}{7}\big). 5m$
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Answer

Radius of the sphere $= 5m$
Now, volume $=\frac{4}{3}\pi\text{r}^3$
$=\frac{4}{3}\times\frac{22}{7}\times5^3$
$=523.81\text{cm}^3$
$\therefore$ Surface area $=4\pi\text{r}^2$
$=4\times\frac{22}{7}\times5^2$
$=314.29\text{cm}^2$

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